When you tell people you're pregnant, they will likely share well wishes as well as unsolicited advice about this journey. And although some of the tips will be legitimate, others may be based in myth.

That said, if a person did not work out regularly prior to pregnancy, Urrutia suggested they ease into a new exercise routine.

"I don't recommend a woman starts running very long distances a day when she gets pregnant if that is not what her previous workout schedule looked like," she said. "But if she ran a lot, she can continue doing that."

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Myth 2: You should avoid all seafood.

According to Urrutia, seafood is a good source of nutrients people need during pregnancy.

"The concern is over mercury and certain fish have high mercury levels, but there are several websites where pregnant women can go and see what the highest risk fish are," she said. "Usually, the mercury is high in predator fish like swordfish or king mackerel."

That said, everyone's body is different and only you and your doctor know what's right for you. For specific information about calorie intake during pregnancy, please consult your OB-GYN and physician.

"People often get heartburn during pregnancy because the valve between the esophagus and the stomach relaxes and opens up," she said. "Normally, with a non-pregnant person, the valve keeps the acid in the stomach but if you're pregnant the acid just goes up and bathes the esophagus. This is when women feel heartburn."

She added that a lot of people get heartburn and a lot of babies are born with hair, so connecting the two is a stretch.

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Myth 5: You have to give up coffee.

Unlike alcohol, there is no reason to give up coffee.
Shutterstock/Simon Mayer

"One or two servings of caffeine a day has not been shown to cause any harm to a pregnant woman," Urrutia said.

Myth 7: You can't dye your hair.

It is OK to dye your hair when you are pregnant.
Steven Saphore/Reuters

Urrutia said the fear is the hair dye molecules will get into your bloodstream and have negative effects on the fetus. But the fear isn't based in any facts.

"Most hair dye molecules are quite large so we think they're probably not getting in," she said. "But anything you put on your skin could get into your bloodstream and we don't have enough research looking at this so I just leave it up to the patients."